package com.wrx.server.util;

import org.springframework.stereotype.Component;

import javax.xml.crypto.Data;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

@Component
public class IDateUtils {

    /**
     * 把出生日期字符转换为日期格式"yyyy-MM-dd"
     * @param strDate
     * @return
     * @throws ParseException
     */
    public Data parse(String strDate) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        return (Data) sdf.parse(strDate);
    }

    public int countAge(Data birthDay) {
        Calendar cal = Calendar.getInstance();
        if (cal.before(birthDay)) { //出生日期晚于当前时间，无法计算
            throw new IllegalArgumentException("出生日期晚于当前时间，无法计算!");
        }
        int yearNow = cal.get(Calendar.YEAR);  //当前年份
        int monthNow = cal.get(Calendar.MONTH);  //当前月份
        int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH); //当前日期
        cal.setTime((Date) birthDay);
        int yearBirth = cal.get(Calendar.YEAR);
        int monthBirth = cal.get(Calendar.MONTH);
        int dayOfMonthBirth = cal.get(Calendar.DAY_OF_MONTH);
        int age = yearNow - yearBirth;   //计算整岁数
        if (monthNow <= monthBirth) {
            if (monthNow == monthBirth) {
                if (dayOfMonthNow < dayOfMonthBirth) age--;//当前日期在生日之前，年龄减一
            }else{
                age--;//当前月份在生日之前，年龄减一
            }
        }
        return age;
    }


}
